| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminated white polyester film for metal laminate which is excellent in laminating properties, wear resistance and molding processability, and also has a beautiful surface after being bonded with metal plates, particularly an aluminum plate and molded, and is suitable for metal cans, particularly an aluminum can. SOLUTION: The polyester film is obtained by laminating a layer (B-layer) made of polyester 3 using ethylene terephthalate and/or butylene terephthalate as a main repeating unit on at least one surface of a polyester layer (A-layer) which is prepared by mixing 80 to 20 wt.% of polyester 1 using ethylene terephthalate of a melting point at 246 to 270 deg.C as a main repeating unit and 20 to 80 wt.% of polyester 2 using butylene terephthalate of a melting point at 180 to 240 deg.C as a main repeating unit. The film has 30 to 55 mmol/kg of COOH terminal group amount and the laminated white polyester film for metal laminate is prepared by mixing the A-layer and/or the B-layer with a white pigment. |
